Mechanism for converting motion.



R. F. 'HLAVATY.

M ECHANISMFOR 00 mm MOTION. KPPLICATION FILE: H1. 1911.

I 1,275,248. -PatentedAug. 13",1918.

- Invenior onion gran JOSEPH nuzootr r. mnvnrv, or CHICAGO, mmois, Ass

7 mean, or 'onrcAeo, rtrlrirors.

' MECHANISM non oonvn'n'rme morrori.

Specification of Letters Patent. P a'tentd'Aug. 13, 191

1 Applicatlog filed May 17, 1917; Serial No. 169,181.

To all whom it may concern: 1 V Be it known that I, RrmoLr F. HLAVATY, a

citizen of Bohemia, and a. resident of;-Chicago, in the county of Cook, State of Illinois,

have invented certain new and useful Improvements in Mechanisms for Converting Motion, of which the cation. i

This invention relates to that type ofmechanisms adapted to convert a constant ro tary motion into an intermittent rotary motion, and which is adapted more particularly foruse inthe intermittent film feeding? type of motion picture machines.

'And the" presentimprovement has for its object to provide a structural formation and association of parts wherebythe above men tioned conversion is attained in 'anaccura te and effective manner, without any lost motion between the parts, andby which the periodsof rest of the driven element of'the mechanism'can be increased to embrace a large portion of the complete revolution-of the same, all aswill hereinafter more fully ap ear. p 1' 7 n the accompanying drawings Figure 1, is a side elevation of the present mechanism, the driving shaft being shown insect-ion,

Fig. 2, is an end elevation of'the same. Fig. 3, is a planview of the driving'cam' wheel or drum,'de tached.{ 3 r Fig. 4, is a section of the same on line Fig. 5, is a vertical section showing the parts in that-(position in which active rotation is f being imparted to the intermittent driven inion or drum. 7 w

Simi ar reference numerals indicate like parts" in the several views. j Referring to the drawing, 1 designates the driving shaft, and 2 the driven shaft of the mechanism, journaled in angular relationjto each other in suitable bearings of a supporting frame or housing. The said driven shaft 2 being usually associated with the intermittent film feeding sprocket drum ofa'motion' picture machin 3 designates the driving cam wheel or drum, .fixed on the 1 driving ffshaft 1 and formed with a peripheral channelor groove 4 of a V shape having a flat bottom; At'on'e point .in the circumference of the wheel 3 said holding channel {is gapped'andinerges into a pair of spirally arfanged'branch chanfollowing is a specifi in the perimeter of said :wheel-and as usual in the present type of mechanisms. 'In the present construction the said spiral channels have parallel and spaced relation to each other, and. are adapted to receive a pair.- of the. radial prongs of the hereinafter described driven wheel ofthe mechanism that are next adjacentto the perimeter of the driving wheel 3, as said driven wheel receives a partial rotation by a detail construction of the driving wheel. as follows 6 designates a spirally-arranged operating ridge located between and separating the branchchannels 5, 5'aforesaid, and preferably of a rounded form in cross-section, as shown. In a spiral or oblique direction said operating ridge 6 is of a: concave form approximately concentricwith the axis of, the

driven wheel heretofore referred to, and owing to such concave formrin connection with its oblique arrangement the operating ridge 6xis adapted to have operative contact with'the next adjacent pair of radial prongs of the driven wheel during the periods in mittent rotation;

In'Figs. 1,2, 3 and 5 of the drawing the peripheral channel 4: andspiral concave rib 6 of the driving wheel 8 are arranged nearer to one end of the perimeter of the. wheel in order that a more'compact transverse are rangement of the driven shaft 2 and associated mechanisms maybe had. With such formation one end of the-ridge 6 and. ofa branch channel 5 will terminate in the above described nearer side of the wheel 3, while the other end of the ridge 6 and of the other branch channel 5, will terminate in the perimeter of the wheel 'as shown. Y

The star wheel or pinion above referred to, comprises a-hub 7, preferably of the hexagonal shape shown, and from alternate faces or facets of which extend a plurality offradial cone shape prongs 8, preferably three in number. Each alternate 1 face. or

wh'ch said driven wheel is receiving inter- 1 nels 5, 5, which ,extendin opposite directions,

facetof said hub extends beyond thebase of thefadj'acent prong- 8 and it is adaptedjfor close slidingengagement' with the walls of the V shaped chann'el of the drlving :wheel 3 to prevent any independent inovernentofthe; star wheel during the per1odm"wh1ch' said holding channel a'nd said faces: of .the 1 hub are in operative engagement: 'Inethe present s'tru'cturethere clearance between the prongs 7 and the Walls of the holding channel land the bearingengagement of the star with said holdingchannel .syvholly by means of the series of three alternate bearing faces or facets of the hub 8, above described,

cient -p'rOViSiCmfoT taking up'"los't motion" between the parts dueto Wear and the like, and which is attained'byanadjustment of the-hub 7 and itscarryin'g shaft 2 toward the-'centerbffthe driving Wheel 3 to effect a close and extended i contact between the faces o f'the'holdin'g chann'el l and'the an" gul'ar faces of thehub 'i' aforesaid.

With thepresentconstruction the holding channel 4, during approximately seveneighths of a complete re-volution of the driV- 7 ing Wheel 3,- is in engagement with the; bearing "faces" or facets of the hub '7 of the star Wheel, to hold the"same"positively against any turning: movement: In --'the present construction as the concave and spirally arranged ridge 6 bf the driving Wheel enters "-into engagement with V the radial prongs 8 of' the'driven- Wheelysaid ridge 6 moves between and has operative engagement with adjacent sides of an adja centfipair of' the radialprongsS of the driven Wheel, and during such engagement imparts a:* rapid semi-revolution to said driven Wheel,- with an absence ofquiver, due to 'the extended'surface contact bet-Ween the parts provided by the present construction. With a =termin-ation of the operative engagement just described 'a' succeeding pain of bearing fa'ce's-of the hub 7 haveholding engage ment' with the Walls of the'holdin'g: channel 4., for a repetitionof the-operation abovedescribed;

. In thei -above des'cribedoperation of the parts, the pair 'of spirally arranged channels' 5,-5 providerclearance for-the-outer ends of the radialpro'ngs, 8 of the star Wheel in the semi-revolutions of the samee Having thus fully: described my said invention, What I claim asnevvand "desire to secure by" Letters Patent is lfIn 'an" intermittent rotary movement mechanism,:-the combination of a driving Wheel formed'vvith'an approximately V-shape peripheral channel-ending i-n a-spaCe OL gap and with :a spirally arranged concave ridge disposed in said gap, and a driven Wheel comprisin glva' faceted hub and aplurality of raclial pron gs, the faceted hub being adapted for bearing engagement -in 9 i the' aforesaid peripheral channel and pairs of the radial prongs "havingcserial straddling operative engagement With the'aforesaid spiral ridge, substantially as set' forth.=

2;- In an inte rmttent? rotarymovement in y f radial"prongs,

opposite directions,

mechanism, the combination of a driving Wheel formed With an approximately V shape gapped peripheral chaniielending in a pair ofspiral branch channels extending: inopposite directions, rally arrangedconcave ridge disposed between said branch channels, and, a driven Wheel comprising a faceted hub and a pluthe faceted hub being adapted for bearing engagement in the V shape channel aforesaid and pairs-of'the radial prongs J having seri al' straddling =engagem'ent with the aforesaid spiral ridge; substantially as set forth. 7

3] In an intermittent rotary movement ineehanisn'n the combination of adriving- Wheel formed with an approximately V-shape peripheral channel ending in 1a. space-or gap and With'a spirally arranged concave rid-ge of a rounded form in cross section disposed in said gap,- and: driven I Wheel: comprising 1 a faceted huband a pluralit'y of radial prongsEhaVing a cone-shape, the faceted hub being --adapted= for bearing-- engagement in the aforesaid peripheral channel 'andpairs of the radial prongs having serial straddling operative engagement With-theaforesaidspiral ridge, substantially as set forth; V

4'. In an intermittent rotary -move'ment mechanism,-the-co' binatibn of a driving Wheel formedn with an approximatelyv -gapped peripheral channel ending ina pairoff spiral branch channels extending in and with a spirally oar-i ranged concave ridge. ofa rounded form' in cross-sectiorr disposed betweensaid branch channels, -and a driven Wheel-comprising-a faceted hub and a plurality of radial-prongs having-a cone shape, the faceted hub being adaptedfor'bearing engagement inlthe aforesaid peripheral channel and-pairs-of the radial prongs having serial straddling: 'operative engagement with the spiralfridge aforesaid, substantially asset forth. 7

5; In an intermittent rotary vmovement mechanism, the combinationof'-ia driving Wheel formed With an approximately v shapechannel ending-ain--aspacekor. gap and With a spirally arrangedconcave ridge disposed in, said-gap,;- and-a driven-Wheel comprisinga hub of a hexagonal shapeanda plurality of radial prongs, the faceted hub being, adapted for bearing engagement in the aforesaid peripheral channel and pairs of the radial prongs (adapted forv serial straddling engagement with. the spiral; con cave ridge aforesaid, substantially asset forthr, 7

6. In an intermi-ttent s-rotary', movement mechanism; the 5 combination of driving Wheel formed Wltl1 am -approximately V shape peripheral channel; ending in a pair of; spiral branch channelsextendirrgin =opposits directions,

and With a spiranged concave ridge disposed between said branch channels, and a driven wheel comprising a hub of a hexagonal shape and a plurality of radial prongs, the hexagonal hub being adapted for bearing engagement in the V shape channel aforesaid and pairs of the radial prongs having serial straddling operative engagement with the aforesaid spiral ridge, substantially as set forth.

7. In an intermittent rotary movement mechanism, the combination of a driving wheel formed with an approximately V shape peripheral channel ending in a space or gap and with a spirally arranged concave ridge of a rounded form in cross- 'section disposed in said gap, and a driven wheel comprising a hub of a hexagonal shape, and a pluraliity of radial prongs having a cone shape, the hexagonal hub being adapted for bearing engagement in the V shaped channel aforesaid and pairs of the radial prongs having serial straddling operative engagement with the aforesaid spiral ridge substantially as set forth.

8. In an intermittent rotary movement mechanism, the combination of a driving wheel formed with an approximately V shape peripheral channel ending in a pair of spiral branch channels extending in opposite directions, and with a spirally arranged concave ridge of a rounded form in cross-section disposed between said branch passages, and a driven wheel comprising a hub of a hexagonal shape and a plurality of radial prongs having a cone shape, the hexagonal hub being adapted for hearing in the aforesaid V shape channel and with pairs of the radial prongs having serial straddling operative engagement with the aforesaid spiral ridge, substantially as set forth. 7

Signed at Chicago, Illinois, this 12th day of May, 1917.

RUDOLF F. HLAVATY.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents. Washington, D. G. 

